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San Francisco to Ontario SFO → ONT

San Francisco International Airport (SFO) → Ontario International Airport (ONT)

The cheapest return found recently is $146 with Frontier Airlines, 6 Nov – 9 Nov, found today. The cheapest one-way found recently is $20 with Frontier Airlines, 15 Dec, found yesterday.

Return

The cheapest return fare on each of 6 departure dates is usually $113 to $139.

Cheapest return found recently

$146

6 Nov – 9 Nov · Frontier Airlines

San Francisco International Airport (SFO) → Ontario International Airport (ONT)

Leaves 6:04 p.m. · Return leaves 12:01 p.m. · 3 h 1 min of travel, both ways together

out nonstop, back nonstop

found today

See prices for these datesCheck today's price

Cheapest nonstop return

$146

6 Nov – 9 Nov · Frontier Airlines

San Francisco International Airport (SFO) → Ontario International Airport (ONT)

Leaves 6:04 p.m. · Return leaves 12:01 p.m. · 3 h 1 min of travel, both ways together

out nonstop, back nonstop

found today

See prices for these datesCheck today's price

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Found recently, and the cheapest we hold

Cheapest found recently $146 6 Nov – 9 Novfound todaySee prices for these dates

Cheapest we hold, of any age $67 16 Nov – 22 Novfound 2 days agoSee prices for these dates

What have prices looked like?

Over 25 days, 24 Sept to 18 Oct, the cheapest return we saw each day was $53 to $109.

At $146, the cheapest return found recently is above that range.

25 days is a short history, so treat this range as an early guide.

Those were the prices on those days, not today's.

Is this a good return price?

Compared with the cheapest return fare on each of 6 departure dates from 23 Oct to 16 Nov, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.

Could nearby dates be cheaper?

We hold no other 3-night return fares leaving within 3 days of 6 Nov to compare.

Every date we hold

8 fares on 6 departure dates

23 Oct – 26 Oct: $203, found 5 days ago30 Oct – 12 Nov: $144, found 5 days ago6 Nov – 8 Nov: $110, found 4 days ago13 Nov – 15 Nov: $122, found 2 days ago15 Nov – 20 Nov: $121, found 5 days ago16 Nov – 22 Nov: $67, found 2 days agoOctNov
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
23 Oct – 26 Oct$203Frontier AirlinesSan Francisco International Airport (SFO) → Ontario International Airport (ONT)out nonstop, back nonstopfound 5 days agoSee prices for these dates
30 Oct – 12 Nov$144Frontier AirlinesSan Francisco International Airport (SFO) → Ontario International Airport (ONT)out nonstop, back nonstopfound 5 days agoSee prices for these dates
6 Nov – 8 Nov$110Frontier AirlinesSan Francisco International Airport (SFO) → Ontario International Airport (ONT)out nonstop, back nonstopfound 4 days agoSee prices for these dates
13 Nov – 15 Nov$122Frontier AirlinesSan Francisco International Airport (SFO) → Ontario International Airport (ONT)out nonstop, back nonstopfound 2 days agoSee prices for these dates
15 Nov – 20 Nov$121Frontier AirlinesSan Francisco International Airport (SFO) → Ontario International Airport (ONT)out nonstop, back nonstopfound 5 days agoSee prices for these dates
16 Nov – 22 Nov$67Frontier AirlinesSan Francisco International Airport (SFO) → Ontario International Airport (ONT)out nonstop, back nonstopfound 2 days agoSee prices for these dates

Which month looks cheapest?

November 2026 is the cheapest month — from $67.

October 2026From $1442 departure dates30 Oct – 12 Nov · found 5 days agoSee prices for these dates
November 2026From $67Cheapest seen4 departure dates16 Nov – 22 Nov · found 2 days agoSee prices for these dates

Airlines on the cheapest dates: Frontier Airlines.

One-way

The cheapest one-way fare on each of 11 departure dates is usually $23 to $59.

Cheapest one-way found recently

$20

15 Dec · Frontier Airlines

San Francisco International Airport (SFO) → Ontario International Airport (ONT)

Leaves 9:56 p.m. · 1 h 27 min trip

nonstop

found yesterday

Open this tripCheck today's price

Cheapest nonstop one-way

$20

15 Dec · Frontier Airlines

San Francisco International Airport (SFO) → Ontario International Airport (ONT)

Leaves 9:56 p.m. · 1 h 27 min trip

nonstop

found yesterday

Open this tripCheck today's price

FareTell may earn a commission when you book through a partner.

Found recently, and the cheapest we hold

Cheapest found recently $20 15 Decfound yesterdayOpen this trip

Cheapest we hold, of any age $19 8 Decfound 6 days agoOpen this trip

What have prices looked like?

Over 25 days, 24 Sept to 18 Oct, the cheapest one-way we saw each day was $17 to $31.

$20, the cheapest one-way found recently, sits here in that range of $17 to $31.

25 days is a short history, so treat this range as an early guide.

Those were the prices on those days, not today's.

Is this a good one-way price?

Compared with the cheapest one-way fare on each of 11 departure dates from 26 Oct to 15 Dec, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.

Could nearby dates be cheaper?

Yes. Among one-way fares leaving within 3 days of 15 Dec, 12 Dec costs $19: $1 less than the cheapest found recently.

Frontier Airlines · San Francisco International Airport (SFO) → Ontario International Airport (ONT) · nonstop · found 3 days ago

Open this tripCheck today's price

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Every date we hold

11 fares on 11 departure dates

26 Oct: $31, found 2 days ago29 Oct: $69, found yesterday30 Oct: $94, found 6 days ago6 Nov: $26, found 5 days ago13 Nov: $28, found 6 days ago16 Nov: $33, found yesterday21 Nov: $48, found 3 days ago24 Nov: $114, found yesterday8 Dec: $19, found 6 days ago12 Dec: $19, found 3 days ago15 Dec: $20, found yesterdayOctNovDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
26 Oct$31Frontier AirlinesSan Francisco International Airport (SFO) → Ontario International Airport (ONT)nonstopfound 2 days agoOpen this trip
29 Oct$69Frontier AirlinesSan Francisco International Airport (SFO) → Ontario International Airport (ONT)nonstopfound yesterdayOpen this trip
30 Oct$94Frontier AirlinesSan Francisco International Airport (SFO) → Ontario International Airport (ONT)nonstopfound 6 days agoOpen this trip
6 Nov$26Frontier AirlinesSan Francisco International Airport (SFO) → Ontario International Airport (ONT)nonstopfound 5 days agoOpen this trip
13 Nov$28Frontier AirlinesSan Francisco International Airport (SFO) → Ontario International Airport (ONT)nonstopfound 6 days agoOpen this trip
16 Nov$33Frontier AirlinesSan Francisco International Airport (SFO) → Ontario International Airport (ONT)nonstopfound yesterdayOpen this trip
21 Nov$48Frontier AirlinesSan Francisco International Airport (SFO) → Ontario International Airport (ONT)nonstopfound 3 days agoOpen this trip
24 Nov$114Frontier AirlinesSan Francisco International Airport (SFO) → Ontario International Airport (ONT)nonstopfound yesterdayOpen this trip
8 Dec$19Frontier AirlinesSan Francisco International Airport (SFO) → Ontario International Airport (ONT)nonstopfound 6 days agoOpen this trip
12 Dec$19Frontier AirlinesSan Francisco International Airport (SFO) → Ontario International Airport (ONT)nonstopfound 3 days agoOpen this trip
15 Dec$20Frontier AirlinesSan Francisco International Airport (SFO) → Ontario International Airport (ONT)nonstopfound yesterdayOpen this trip

Which month looks cheapest?

December 2026 is the cheapest month — from $19.

October 2026From $313 departure dates26 Oct · found 2 days agoOpen this trip
November 2026From $265 departure dates6 Nov · found 5 days agoOpen this trip
December 2026From $19Cheapest seen3 departure dates8 Dec · found 6 days agoOpen this trip

Airlines on the cheapest dates: Frontier Airlines.

Premium cabin fares from San Francisco to Ontario

We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.

Today's prices for 6 Nov – 9 Nov in another cabin: Premium economy · Business · First

Today's prices for 15 Dec in another cabin: Premium economy · Business · First

How far ahead were prices cheapest for San Francisco to Ontario?

Return

Fares 30 to 59 days before departure were typically 73% lower than 0 to 6 days before departure.

From the cheapest return each day between 24 Sept and 18 Oct (25 days), grouped by how many days ahead the flight left; one adult in economy.

Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.

Prices reflect recent searches — current fares may differ.

See these ranges as a table
Typical price in each booking range — round trip, per traveler in Economy.
Booked ahead byTypical fareCheapest dayAbove the cheapestDays of prices
0–6 days$203$144+269%17
7–13 days$149$133+171%21
14–29 days$117$67+113%19
30–59 days$55$53Cheapest seen24
60–89 days$89$55+62%9

One-way

Fares 30 to 59 days before departure were typically 64% lower than 0 to 6 days before departure.

From the cheapest one-way each day between 24 Sept and 18 Oct (25 days), grouped by how many days ahead the flight left; one adult in economy.

Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.

Prices reflect recent searches — current fares may differ.

See these ranges as a table
Typical price in each booking range — one way, per traveler in Economy.
Booked ahead byTypical fareCheapest dayAbove the cheapestDays of prices
0–6 days$73$30+181%17
7–13 days$40$30+52%24
14–29 days$31$24+19%22
30–59 days$26$17Cheapest seen23
60–89 days$33$17+27%24
180+ days$221$152+750%10

Could a nearby airport be cheaper?

A different airport at either end can change the fare — sometimes a lot.

Return

San Francisco → Los Angeles

56 km from Ontario

$76

$70 less than flying to Ontario

21 Dec – 23 Dec · SFO → LAX · out nonstop, back nonstop

found 18 hours ago

See this route

San Francisco → Palm Springs

104 km from Ontario

$423

$277 more than flying to Ontario

25 Oct – 1 Nov · SFO → PSP · out nonstop, back nonstop

found yesterday

Check today's price

San Jose → Ontario

67 km from San Francisco

$622

$476 more than flying from San Francisco

16 Nov – 22 Nov · SJC → ONT · out 1 stop, back 1 stop

found 2 days ago

Check today's price

Oakland → Ontario

13 km from San Francisco

$696

$550 more than flying from San Francisco

16 Nov – 22 Nov · OAK → ONT · out 1 stop, back 2 stops

found 2 days ago

Check today's price

Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.

One-way

San Francisco → Los Angeles

56 km from Ontario

$47

$27 more than flying to Ontario

29 Dec · SFO → LAX · nonstop

found 14 hours ago

See this route

Oakland → Ontario

13 km from San Francisco

$178

$158 more than flying from San Francisco

24 Nov · OAK → ONT · nonstop

found yesterday

Check today's price

Cheapest recent price on each route — one way, per traveler in Economy. Distances are in a straight line.

Live price for these dates

The cheapest return found recently is for 6 Nov – 9 Nov. A live search on this page shows what those dates cost now, for one adult in economy.

Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work